Development of an all-solid-state air-cooled high-power blue diode laser for metal processing

Area of Science:

• Optics and Photonics
• Materials Science
• Laser Technology

Background:

• Precision manufacturing of copper components requires advanced laser systems.
• Existing laser technologies often rely on fluid cooling, limiting portability and increasing complexity.
• High-power, stable blue laser sources are crucial for efficient material processing.

Purpose of the Study:

• To design and develop a compact, all-solid-state, air-cooled blue laser system with a 100 W scale output.
• To demonstrate the system's capability for precision copper works, including cutting, bending, and soldering.
• To investigate the mechanical properties of laser-processed copper joints and annealed copper strips.

Main Methods:

• Integration of powerful laser-diode arrays with Peltier chips for thermal management in a compact laser head.
• Thermal simulation and experimental validation of the laser head's thermal performance.
• Characterization of the laser system's output power, wavelength, stability, and wall-plug efficiency.
• Demonstration of copper processing applications and analysis of joint adhesion and material resilience.

Main Results:

• Development of a 100 W class, all-solid-state, air-cooled blue laser system (λ = 452.2 ± 2.5 nm).
• Achieved stable operation with 98% power stability and ~24% wall-plug efficiency in a portable enclosure.
• Demonstrated kW/cm² intensity for cutting, bending, and soldering copper on battery packs, resulting in nanoscale adhesion without cracks.
• Showcased laser annealing (0.5-4 kW/cm²) enhancing copper strip resilience to extreme loading cycles without cracks.

Conclusions:

• The developed all-solid-state blue laser system offers a stable, efficient, and portable solution for precision copper applications.
• The system enables high-quality copper processing with superior joint integrity and material durability.
• This technology represents a significant advancement in air-cooled, high-power laser systems for industrial manufacturing.